REVERSAL OF ASVMMKTKV IN CRUSTACEA. 247 



Aiming towards an answer for these que-tion- a number of 

 experiment - \vep- performed the re-ult- of which may now be 

 i onsidered. 



Fifty healthy -pecimens representing the five different >JKM 

 \\en- selected, and tested as to their tendency t<> reverse the 

 :nniftry of tin- first pair of chela 1 during tin- regeneration 

 following tin- removal of the great chela. Without exception 

 all ot" the specimens responded as Przibram had found, a -mall 

 chela regenerated Irom the stump of the original great one and 

 the small ( hela of the opposite side metamorphosed into a ^reat 

 chela. Forty of the specimens favorably survived the experi- 

 ments. 



FIRST SERIES. 



Nineteen individuals had the great chela removed and in addi- 

 tion a numU-r of posterior appendages were amputated from 

 the opposite or small chela side, so as to allow tin- greater ma 

 oi material to remain on the original great (hela -ide. The 

 op t 'rat ion i- illustrated by Fig. I, A, and the opposite or < "in ml 

 operation by Fig. I, B, or specimens lo, 12 and ,}i in the table. 

 \\< ' rrii . to the table the results of such an experiment ma\ be 

 ertained. 



The left side of the table gives the date of the oprratitni. the 

 number of the specimen, and the appendages rrmo\ed are indi- 

 cated b\ .v, (/and 5 in the first appendage column indicate the 

 it and -mall chela. The right side of the table i;i\e- the 

 time ot moulting and the manner of regeneration, the r signifies 

 a new or : :ated Kv. (/and .V in the tir-t appendage column 



m indicate the great and small chela. The horizontal lines 

 ot the table are BO arranged that the appendages on tin- right 

 side of an indi\idual ate gi\en immediately above those on the 

 left of the same animal, c. g., specimen I had the great chela and 

 the -ei ond leg removed from the right side and the fourth leg 

 from the left side in the first instance. Kach -pecinieli, as tin- 

 table sh,.\\s, \\as operated upon a second time during the experi- 

 ments. 



Of the nineteen cases having the great chela removed from one 

 side and other appendage- than the lifst chela trotn the opposite 

 -ide i he -mall chela. e\ en though it wa> uii the -ide of less mate- 



